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(No Model.) 2 Sheets-Sheet 1 L. P. GRISWOLD'.

SHADE RING CLAMP.

No. 269,783. Patented Dec.26,1'882.-

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(No Model.) v 2 Sheets-Sheet 2.

L. P. GRISWOLD.

. SHADE RING CLAMP. No. 269,783. PatBnted'DemZG, 1882.

E? Witnesses Jaw/min? Zea/019], azmwold.

UNTTE STATES PATENT Three.

LEWIS F. GRISWOLD, OF MERIDEN, CONNECTICUT, ASSIGNOR TO THE CHAS. PARKERCOMPANY, OF SAME PLACE.

SHADE-RING CLAMP.

SPECIFICATION forming part of Letters Patent No. 269,783, dated December26, 188?, application filed November 16, 1882. (No model.)

To all whom it may concern:

Be it known that I, LEWIS F. GRISWOLD, a citizen of the United States ofAmerica, residing at Meriden, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements inShadelting Clamps; and I do hereby declare the following tube afull,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being bad to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspecification.

The ghjectot' this invention is to provide novel and improved means forholding lampshades to shade.- rings or other supports, whereby thebrittle material of said shades shall be exempted from all risk offracture arising from such fastening, and a single set of attachingdevices may be used with divers sizes ofshades, said devicesautomatically adjusting themselves thereto. I accomplish this ob ject byproviding a shade-ring with movable clamping-plates, which are formedwith hooks that catch under the neck of the shade, said plates beingfastened to said shade-ring by screws, preferably the same which attachthe harp or lamp-support thereto.

1htheaccompanyingdrawings,Figure1 represents a sideelevationoftheshade-ring, shade, and harp of an extension-lamp, my improvementbeingapplied thereto. Fig.2 represents a vertical section through thesame. Fig. 3 represents a plan view of the shade ring and clamps, andFig. at represents a detail viewof one of said clamps.

The same letters indicate the same parts in each of the figures. v

A designates the lamp-support or harp; B, the shade-ring, to which it isattached by bolts u a; and C the shade, which is secured to said ringwithin the annular flange C, that extends down from the outer lower edgeof the latter, as usual. All of these parts, as shown, are suited to anordinary extension-lamp fixture.

Heretofore screws have generally been passed through flange G and turnedinto the neck of the shade; (which is ordinarily of porcelain orsimilarbrittle material,) under the enlarged upper end thereof. This method ofattachment is moderately secure; butit inevitably causes the fracture ofmany shades, and it is not automatically adjustableto suit differentsizes. To avoid these defects I employ clamp-plates D D on oppositesides of said shade-ring, each clamp-plate consisting'of a horizontalflat body, (I, having a bifurcated inner end,d, and a downwardly-extending hook, 61 which protrudes through an opening, 0, in theupper flange, C and lower flange, C", which make up the external wall ofthe shadering. The outer faces of these hooks are preferably adapted byshape and ornamentation to form part of said wall and be flush with theface thereof. The bodies (Z of the clamps rest upon the usual horizontalflange, G on the inside of the shade-ring, and on perforated lugs E,which extend still farther inward therefrom. The perforations oropenings of said lugs register with the slots which give the bifurcatedshape to the inner ends of said clamping-plates. It is obvious thatthese plates may be readily drawn into contact with any one of diverssizes of shade, the hooks d catching into the necks thereof, so as toanswer the purpose of the ordinary fastening-screws, without any oftheir inconveniences or defects. Bolts are then passed through theperforations in the lugs E, and the slots in the bifurcated inner ends,d, ofclamping-plates D, and their nets are turned home on top of thelatter. These bolts are preferably, though not necessarily, the bolts aa, which fasten harp A to shade-ring B.

These devices are especially serviceable with extension-lamps, but maybe used with those of any other kind.

Springs may be employed to render the action of the hooks automatic.

1 am aware that it is notbroadly new to employ clamping-plates for theattachment of a lamp-shade to its means of suspension or support, nor tosupply such plates with springs for rendering them automatic, andtherefore I do not claim such constructions, broadly; but

What 1 do claim is 1 l. A shade-ring, in combination with slidingclamping-plates having a hook at one end and bifurcated or slotted atthe other, and bolts which fasten the same together, substantially asset forth.

\ In testimony whereof I affix my signature in to l 2. A shade-ringprovided with perforated 1 presence of two witnesses.

lugs andsicle openings, in combination with bifurcated clamping-plateshaving hooks for grasping the neck of a lamp-shade, a harp or lawp-snpport, and bolts which serve to attach said harp and said clamps tosaid shade-ring, substantially as set forth.

LE \VIS F. G-RIS\VOLD.

Witnesses:

DEXTER W. PARKER, RALPH A. PALMER.

